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Port 6951 (otlp)

IANA assigns port 6951 to otlp: OTLP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
otlp TCP OTLP Brent Foster -
otlp UDP OTLP Brent Foster -

Registry dates for this port: registered 2006-04.

Check what is listening on port 6951

Linux: is anything listening on TCP 6951?
sudo ss -tlnp 'sport = :6951'
Linux: UDP 6951
sudo ss -ulnp 'sport = :6951'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6951
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6951 '
Windows (Command Prompt)
netstat -ano | findstr :6951
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6951 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6951
From Windows
Test-NetConnection HOST -Port 6951
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6951

Block port 6951 in the firewall

ufw
sudo ufw deny 6951/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6951 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6951 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6951' -Direction Inbound -Protocol TCP -LocalPort 6951 -Action Block
ufw
sudo ufw deny 6951/udp
iptables
sudo iptables -A INPUT -p udp --dport 6951 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6951 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6951' -Direction Inbound -Protocol UDP -LocalPort 6951 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.